Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers

0360231 - ÚFCH JH 2012 RIV US eng J - Journal Article
Bek, David - Balcar, Hynek - Žilková, Naděžda - Zukal, Arnošt - Horáček, Michal - Čejka, Jiří
Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers.
ACS Catalysis. Roč. 1, č. 7 (2011), s. 709-718. ISSN 2155-5435. E-ISSN 2155-5435
R&D Projects: GA AV ČR IAA400400805; GA AV ČR KAN100400701; GA ČR GD203/08/H032
Institutional research plan: CEZ:AV0Z40400503
Keywords : Grubbs catalyst * mesoporous molecular sieves * olefin metathesis
Subject RIV: CF - Physical ; Theoretical Chemistry

Hybrid catalysts for olefin metathesis were prepared by the immobilization of Ru alkylidenes (Grubbs catalysts) on mesoporous molecular sieves SBA-15 and MCM-41 having the surface modified with molecules bearing dicyclohexylphosphine (PCy2) and pyridine end groups. Hybrid catalysts with Ru attached to the surface via PCy2 ligands exhibited higher activity and stability than those with Ru attached via pyridine ligands. The former catalysts exhibited a high activity in a series of metathesis reactions (RCM, ROMP, and cross-metathesis) reaching turnover numbers (TONs) from 200 to 2000 and being reusable several times. The filtration tests for all catalysts suggested that the solid catalysts were responsible for catalytic activity during the reactions. Only low Ru leaching was observed. A positive effect of the pore size of the support on catalyst activity was observed for the metathesis of methyl oleate.
Permanent Link: http://hdl.handle.net/11104/0197829